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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
420031091422601 2015USGS GPW4
Sand and gravel aquifers (glaciated regions)
Holocene Alluvium
Holocene Alluvium
LOCATION - Lat 42°00'31.5", long 91°42'26.3" referenced to North American Datum of 1983, Linn County, IA, Hydrologic Unit 07080205,
REVISIONS HISTORY - Revisions: Land-surface datum was updated to 720.32 ft NAVD88 on July 26, 2022, as determined by a GNSS Level II survey. Land-surface datum was previously published as 720.11 ft NAVD88. Discrete water-level measurements and groundwater level above NAVD88 time-series data prior to July 26, 2022, are referenced to the original datum.
GROUNDWATER RECORDS
DATUM - Land-surface datum is 720.32 ft above North American Vertical Datum of 1988. Measuring point: top of PVC casing, 2.64 ft above land-surface datum, Sep. 16, 2015 to present.
